Is it normal for a man to drink 10 cups of tea everyday?

My dad stopped smoking and he started drinking tea all day around 5-10 cups everyday with extra sugar. I warned him about it that it might harm his health, but he said it’s okay to drink tea and he likes it. I don’t understand the relation? Before he used to smoke too much daily now he transferred it to tea!
Is it normal for a man to drink 10 cups of tea everyday?
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